mirror of https://github.com/AxioDL/amuse.git
125 lines
3.8 KiB
C
125 lines
3.8 KiB
C
#include "amuse/dsp.h"
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static const int32_t NibbleToInt[16] = {0,1,2,3,4,5,6,7,-8,-7,-6,-5,-4,-3,-2,-1};
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unsigned DSPDecompressFrameRanged(int16_t* out, const uint8_t* in,
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const int16_t coefs[8][2], int16_t* prev1, int16_t* prev2,
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unsigned firstSample, unsigned lastSample)
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{
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uint8_t cIdx = (in[0]>>4) & 0xf;
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int32_t factor1 = coefs[cIdx][0];
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int32_t factor2 = coefs[cIdx][1];
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uint8_t exp = in[0] & 0xf;
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unsigned ret = 0;
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for (int s=firstSample ; s<14 && s<lastSample ; ++s)
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{
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int32_t sampleData = (s&1)?
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NibbleToInt[(in[s/2+1])&0xf]:
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NibbleToInt[(in[s/2+1]>>4)&0xf];
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sampleData <<= exp;
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sampleData <<= 11;
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sampleData += 1024;
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sampleData +=
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factor1 * ((int32_t)(*prev1)) +
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factor2 * ((int32_t)(*prev2));
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sampleData >>= 11;
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sampleData = DSPSampClamp(sampleData);
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*out++ = sampleData;
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*prev2 = *prev1;
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*prev1 = sampleData;
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++ret;
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}
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return ret;
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}
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unsigned DSPDecompressFrame(int16_t* out, const uint8_t* in,
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const int16_t coefs[8][2], int16_t* prev1, int16_t* prev2,
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unsigned lastSample)
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{
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uint8_t cIdx = (in[0]>>4) & 0xf;
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int32_t factor1 = coefs[cIdx][0];
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int32_t factor2 = coefs[cIdx][1];
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uint8_t exp = in[0] & 0xf;
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unsigned ret = 0;
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for (int s=0 ; s<14 && s<lastSample ; ++s)
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{
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int32_t sampleData = (s&1)?
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NibbleToInt[(in[s/2+1])&0xf]:
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NibbleToInt[(in[s/2+1]>>4)&0xf];
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sampleData <<= exp;
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sampleData <<= 11;
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sampleData += 1024;
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sampleData +=
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factor1 * ((int32_t)(*prev1)) +
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factor2 * ((int32_t)(*prev2));
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sampleData >>= 11;
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sampleData = DSPSampClamp(sampleData);
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out[s] = sampleData;
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*prev2 = *prev1;
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*prev1 = sampleData;
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++ret;
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}
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return ret;
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}
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unsigned DSPDecompressFrameStereoStride(int16_t* out, const uint8_t* in,
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const int16_t coefs[8][2], int16_t* prev1, int16_t* prev2,
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unsigned lastSample)
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{
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uint32_t cIdx = (in[0]>>4) & 0xf;
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int32_t factor1 = coefs[cIdx][0];
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int32_t factor2 = coefs[cIdx][1];
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uint32_t exp = in[0] & 0xf;
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unsigned ret = 0;
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for (int s=0 ; s<14 && s<lastSample ; ++s)
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{
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int sampleData = (s&1)?
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NibbleToInt[(in[s/2+1])&0xf]:
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NibbleToInt[(in[s/2+1]>>4)&0xf];
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sampleData <<= exp;
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sampleData <<= 11;
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sampleData += 1024;
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sampleData +=
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factor1 * ((int32_t)(*prev1)) +
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factor2 * ((int32_t)(*prev2));
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sampleData >>= 11;
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sampleData = DSPSampClamp(sampleData);
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out[s*2] = sampleData;
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*prev2 = *prev1;
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*prev1 = sampleData;
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++ret;
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}
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return ret;
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}
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unsigned DSPDecompressFrameStereoDupe(int16_t* out, const uint8_t* in,
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const int16_t coefs[8][2], int16_t* prev1, int16_t* prev2,
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unsigned lastSample)
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{
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uint8_t cIdx = (in[0]>>4) & 0xf;
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int32_t factor1 = coefs[cIdx][0];
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int32_t factor2 = coefs[cIdx][1];
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uint8_t exp = in[0] & 0xf;
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unsigned ret = 0;
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for (int s=0 ; s<14 && s<lastSample ; ++s)
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{
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int sampleData = (s&1)?
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NibbleToInt[(in[s/2+1])&0xf]:
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NibbleToInt[(in[s/2+1]>>4)&0xf];
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sampleData <<= exp;
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sampleData <<= 11;
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sampleData += 1024;
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sampleData +=
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factor1 * ((int32_t)(*prev1)) +
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factor2 * ((int32_t)(*prev2));
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sampleData >>= 11;
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sampleData = DSPSampClamp(sampleData);
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out[s*2] = sampleData;
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out[s*2+1] = sampleData;
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*prev2 = *prev1;
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*prev1 = sampleData;
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++ret;
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}
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return ret;
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}
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